CN219625672U - Traction power supply equipment ground state on-line monitoring device - Google Patents
Traction power supply equipment ground state on-line monitoring device Download PDFInfo
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- CN219625672U CN219625672U CN202320254939.5U CN202320254939U CN219625672U CN 219625672 U CN219625672 U CN 219625672U CN 202320254939 U CN202320254939 U CN 202320254939U CN 219625672 U CN219625672 U CN 219625672U
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Abstract
The utility model discloses an on-line monitoring device for the grounding state of traction power supply equipment, which comprises: the system comprises a data acquisition unit, a calculation evaluation unit and an alternating current/direct current excitation unit, wherein the data acquisition unit is respectively connected with a grounding down wire and the calculation evaluation unit, the tested power equipment is connected with a grounding grid through the grounding down wire, and the alternating current/direct current excitation unit is connected with the grounding down wire and is used for generating a direct current signal or an alternating current test signal different from power frequency; when the AC/DC excitation unit generates a DC signal, the data acquisition unit is used for acquiring the DC potential data of the grounding down conductor; the monitoring device realizes the monitoring of the equipment grounding resistance and the diagnosis of the corrosion of the grounding grid by manual switching excitation (direct current or alternating current), and provides great support for the monitoring of the running state of the grounding grid.
Description
Technical Field
The utility model relates to the technical field of equipment grounding state monitoring, in particular to an on-line monitoring device for the grounding state of traction power supply equipment.
Background
The traction substation is a core facility of the electrified railway, and in order to ensure the safe operation and personnel safety of the railway, a plurality of electrical equipment including the traction transformer in the traction substation are subjected to lightning protection grounding treatment, so that the grounding state of the traction substation is good and is an important factor for ensuring the safe operation of the electrified railway. Because the traction power supply system uses the steel rail and the earth as main reflux paths, larger traction reflux flows through the traction substation grounding system in normal operation. In addition, the ground network of the traction substation in China generally adopts common steel as a ground conductor, and in recent years, galvanized steel is also used for improving the corrosion resistance. However, due to the restriction of site construction conditions, soil corrosion and electrochemical corrosion caused by traction ground reflux, more serious corrosion conditions generally occur after 8 to 10 years of operation, so that the grounding performance is greatly reduced, and the safety of equipment and personnel is seriously threatened.
In the prior art, the running state of a grounding system of a traction substation is lack of effective detection or evaluation means, and particularly, the method for detecting faults such as corrosion, disconnection and the like of a grounding network mainly adopts a power failure sampling excavation method. The method has blindness, large workload and low speed, is limited by on-site operation conditions, and cannot accurately judge break points and corrosion conductors. Meanwhile, the method can cause long-time power failure of a traction substation, and the normal operation of an electrified railway is affected.
In chinese patent application CN107290592a, an online monitoring system for grounding network resistance is disclosed, in which a high-power inter-frequency device is utilized to excite loop current between a tested ground network and a current pole, a data acquisition unit is used to synchronously acquire voltage waveforms between each tested power device and a voltage pole, and a filtering analysis unit is used to calculate inter-frequency voltage difference between each device and zero potential, so as to calculate the grounding resistance of each device. However, as the grounding resistor can still be normal when the grounding network conductor corrodes and even breaks, the system cannot realize conductor corrosion and even break detection, and when the grounding resistor is found to be unqualified or the ground resistor is found to cause accidents, the ground resistor is excavated in a large area to find break points or corrosion sections, so that the ground resistor is blind, the workload is high, and the operation of a power system is influenced.
Disclosure of Invention
In order to solve the problems, the inventor provides an on-line monitoring device for the grounding state of traction power supply equipment, according to the actual measurement circuit environment and requirements on site, by switching an alternating current/direct current power supply to serve as the input of system excitation (current test signal), corresponding excitation is injected into a traction grounding grid, so that the ground resistance monitoring of each equipment and the corrosion condition detection data of steel materials used for lightning-protection grounding of the grounding grid are realized, the condition of a lightning-protection grounding reflux passage of a traction substation is confirmed, and the safety operation and personnel safety of an electrified railway are ensured.
Specifically, the utility model is realized as follows:
an on-line monitoring device for the grounding state of traction power supply equipment, comprising:
a data acquisition unit;
the data acquisition unit is respectively connected with the grounding down lead and the calculation evaluation unit, and the tested power equipment is connected with the grounding grid through the grounding down lead;
the alternating current-direct current excitation unit is connected with the grounding down conductor and is used for generating a direct current signal or an alternating current test signal different from power frequency;
when the AC/DC excitation unit generates an AC current test signal different from power frequency, the data acquisition unit is used for acquiring AC potential data of the grounding down conductor and transmitting the AC potential data of the grounding down conductor to the calculation evaluation unit;
when the AC/DC excitation unit generates a DC signal, the data acquisition unit is used for acquiring DC potential data of the grounding down conductor and transmitting the DC potential data of the grounding down conductor to the calculation evaluation unit.
Further, the ac/dc excitation unit includes:
a direct current power supply;
a variable frequency ac power supply;
the double-power-supply change-over switch is connected with the direct-current power supply and the variable-frequency alternating-current power supply and is used for switching the power supply;
and the current limiting resistor is connected in series with the dual-power supply change-over switch.
Further, the calculation evaluation unit includes:
the data processing module is connected with the data acquisition unit;
and the display screen is connected with the data processing module and used for displaying the measured parameters.
Further, the data acquisition unit is connected with the grounding grid branch circuit through a wiring chuck and is in data connection with the calculation evaluation unit.
Further, the data acquisition unit is a multi-channel data acquisition unit, each channel acquires potential data of a grounding downlead of one branch, and the data acquisition unit is in wireless connection with the calculation evaluation unit.
Further, the data acquisition unit comprises 16 data monitoring terminals and 4 GND terminals, and can acquire 16 paths of electrical quantity signals.
Further, the on-line monitoring device for the grounding state of the traction power supply equipment further comprises a box body, and the AC/DC excitation unit and the calculation evaluation unit are integrated in the box body.
The working principle of the utility model is as follows:
when the grounding grid resistance monitoring is carried out, a current test signal different from power frequency is generated through a variable-frequency alternating-current power supply, loop current is excited between a tested grounding grid and the current electrode, a data acquisition unit is used for acquiring voltage waveforms between tested equipment and a voltage electrode, different-frequency voltage differences between the equipment and zero potential are calculated through a data processing module, the grounding resistance of the equipment is calculated, basic grounding grid resistance monitoring is obtained, and real-time condition of a lightning protection grounding reflux passage of the traction substation is confirmed.
When the corrosion and breakpoint detection of the grounding grid conductor are carried out, a direct current power supply is generated through a variable frequency alternating current power supply, the resistance value of a detected grounding grid branch is detected, and when a detector finds that the detected resistance value is larger than the original resistance value of the branch, the existence of corrosion or fracture of the branch can be judged.
Compared with the prior art, the utility model has the beneficial effects that:
(1) The on-line monitoring device for the grounding state of the traction power supply equipment provided by the utility model can not only measure the grounding characteristic parameters by utilizing alternating current excitation, but also quantitatively identify the corrosion state of the grounding grid by utilizing direct current excitation, thereby providing great support for monitoring the running state of the grounding grid.
(2) The switch is manually controlled to switch between the AC power supply and the DC power supply to generate a DC signal or an AC current test signal different from power frequency, and the operation is simple and convenient.
Drawings
FIG. 1 is a schematic diagram of an on-line monitoring device for the grounding state of traction power supply equipment in the present utility model;
fig. 2 is a schematic diagram of an on-line monitoring device for the grounding state of the traction power supply device in embodiment 1;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
fig. 4 is a block diagram of the on-line monitoring device for the ground state of the traction power supply apparatus in embodiment 1;
fig. 5 is a schematic structural diagram of an ac/dc excitation unit in embodiment 1;
fig. 6 is a terminal arrangement diagram of the data acquisition unit in embodiment 1;
FIG. 7 is a partial enlarged view at B in FIG. 2;
fig. 8 is a schematic diagram of an on-line monitoring device for the grounding state of the traction power supply device in embodiment 2.
Reference numerals:
1-an alternating current-direct current excitation unit; 11-an adjusting knob; 2-a data acquisition unit; 3-calculating an evaluation unit; 31-a display screen; a 32-data processing module; 4-grounding grid; 41-a ground down-lead; 5-a box body; 6-conducting wires; 61-wire clamp.
Detailed Description
The utility model will be described in further detail below with reference to the drawings by means of specific embodiments.
The grounding network is mainly formed by horizontally and longitudinally staggering flat steel, angle steel or steel pipes to form a rectangular network, the vertically and horizontally staggering points are nodes, the grounding down-lead is connected with the nodes, a branch is arranged between the nodes, and a plurality of branches are combined into the grounding network.
Example 1
As shown in fig. 1-5, this embodiment provides an on-line monitoring device for a ground state of a traction power supply device, including: the AC/DC excitation unit 1, the data acquisition unit 2 and the calculation evaluation unit 3 are integrated in the box body 5, a wiring interface is arranged on the box body 5, the AC/DC excitation unit 1 is connected with the grounding down wire 41 through the wiring interface and the lead 6, one end of the grounding down wire 41 is connected with an electrical device, the other end of the grounding down wire is connected with the grounding grid 4, and the AC/DC excitation unit 1 injects corresponding excitation into the traction grounding grid 4 so as to measure grounding characteristic parameters. In this embodiment, the data acquisition unit 2 is a voltage collector, which is connected to the ground down-lead 41 through the wire 6, for collecting a voltage value. Since the ground lead 41 is mostly flat steel, the wire 6 is conveniently connected with the ground lead 41, and therefore, the terminal of the wire 6 is provided with the wire clamp 61, and the wire 6 can be quickly connected with the ground lead 41 by using the wire clamp 61. The data acquisition unit 2 is connected with the box 5 through a data interface, and after the voltage value is acquired, the voltage value is fed back to the calculation and evaluation unit 3, and the calculation and evaluation unit 3 calculates the resistance value according to the existing algorithm.
Specifically, as shown in fig. 5, the AC/DC excitation unit 1 includes a DC power supply DC, a variable frequency AC power supply AC, a double power supply changeover switch K, and a current limiting resistor R, and the switching between the DC power supply DC and the variable frequency AC power supply AC is performed by the double power supply changeover switch K. Which are connected to any two ground down-conductors 41, respectively, to form a loop.
When the ground resistance of the electrical equipment is monitored, the device is switched to a variable-frequency alternating-current power supply AC, the magnitude of an alternating-current test signal input by the variable-frequency alternating-current power supply AC is adjusted through an adjusting knob 11 according to the actual measurement circuit environment and the requirements of the field, at the moment, the data acquisition unit 2 measures voltage waveforms between the tested electrical equipment and voltage poles, and the calculation evaluation unit 3 calculates different-frequency voltage differences between the tested electrical equipment and zero potential, so that the ground resistance of the tested electrical equipment is calculated.
When the earth network corrosion diagnosis is carried out, the system is switched to a direct current power supply DC, and the voltage value of each branch to be measured is measured by the data acquisition unit 2. The grounding grid corrosion diagnosis equation set is as follows:
obtaining node voltage U n And branch resistance R j The relation of (2) is:
the bias conductance of the branch admittance to the jth branch resistance is as follows:
the embedded algorithm for solving the branch resistance increase multiple in the data processing solver consists of a CPLEX solver, a micro processing method, a PSO algorithm and the like. Wherein the theoretical equation for each algorithm is as follows:
(1) CPLEX solver
In equation (1) [ delta ] U Accessible node ＝V△L n In order to solve the equation, constraint condition (4) is satisfied, and the branch resistance increase multiple is obtained by taking the minimum of (5) as an objective function and knowing the node potential and sensitivity matrix.
△L n ≥0，n＝1,2,…b (4)
min||U es -U et || 2 (5)
(2) Micro-processing method
And preprocessing the diagnosis model by adopting a micro-processing method, and linearizing the nonlinear model in a piecewise manner.
△U e0 ＝k s *(U es -U et ) (6)
Wherein k is s And as the micro-coefficient, a smaller value is taken, so that fluctuation in a smaller range is ensured in each iteration solution.
Objective function:
min f(△X 1 ,△X 2 ,…Ω,△X b+1 )＝||△U e0 -M*△X|| (7)
solving equation (53) step by step and iteration to obtain DeltaX j J=1, 2, … b, the node potential U and the sensitivity matrix M are updated.
X j ＝X j *(1+△X j ) (9)
R” j ＝R j *X j (10)
Iteration termination condition:
(3) PSO algorithm
And determining the upper and lower limit ranges of the particles by using a solution obtained by a deterministic algorithm, taking the determined solution as the initial position of the first particle, and randomly setting the rest initial positions.
Fitness function of particle i at the kth iteration:
position and velocity update rule of particle i in d-th dimension:
wherein:
when the particle touches the lower boundary, the velocity and position of particle i are updated at this point:
when the particle hits the upper boundary, the particle i velocity and position are updated as:
when the iteration step number k reaches the upper limit step number k max And stopping the algorithm, outputting the particle optimal positions of all the particle swarms, namely the optimal solution, and obtaining the branch resistance increase multiple according to the algorithm.
The calculation of the ground resistance and the diagnosis of the corrosion of the ground network are all existing algorithms, and the utility model does not relate to the improvement of the algorithms.
Further, the data acquisition unit 2 may employ a single-path voltage acquisition device, which is mainly used for small-scale monitoring of the ground resistance of a specific device or diagnosis of corrosion of a specific branch. When the whole grounding grid 4 or more electrical equipment is used, a plurality of voltage collectors are adopted, preferably, as shown in fig. 6, the data collection unit 2 adopts 16 voltage collectors which comprise 16 data monitoring terminals and 4 GND terminals, and collection of 16 electrical quantity signals can be realized.
The calculation evaluation unit 3 includes: the data processing module 32 and the display screen 31, after the data processing module 32 receives the data acquired by the data acquisition unit 2, the corresponding data is obtained through the existing algorithm, the corresponding data is displayed through the display screen 31, and the display screen 31 can display data such as voltage waveforms, resistance values and the like.
Example 2
As shown in fig. 8, in this embodiment, the data acquisition unit 2 is a multi-path voltage collector, the data acquisition unit 2 is integrated with a wireless transmitter, a wireless receiver is disposed in the box 5, the wireless receiver is connected with the data processing module 32, and the data acquired by the data acquisition unit 2 is sent to the wireless receiver through the wireless transmitter and then is wirelessly received and transmitted to the data processing module 32.
The foregoing description of the utility model has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the utility model pertains, based on the idea of the utility model.
Claims (7)
1. An on-line monitoring device for the grounding state of traction power supply equipment, comprising: the system comprises a data acquisition unit (2) and a calculation evaluation unit (3), wherein the data acquisition unit (2) is respectively connected with a grounding down lead (41) and the calculation evaluation unit (3), and the tested power equipment is connected with a grounding grid (4) through the grounding down lead (41); characterized by further comprising:
the alternating current-direct current excitation unit (1), the alternating current-direct current excitation unit (1) is connected with the grounding down wire (41) and is used for generating a direct current signal or an alternating current test signal different from power frequency;
when the AC/DC excitation unit generates an AC current test signal different from power frequency, the data acquisition unit (2) is used for acquiring AC potential data of the grounding down conductor (41) and transmitting the AC potential data of the grounding down conductor (41) to the calculation evaluation unit (3);
when the AC/DC excitation unit generates a DC signal, the data acquisition unit (2) is used for acquiring DC potential data of the grounding down wire (41) and transmitting the DC potential data of the grounding down wire (41) to the calculation evaluation unit (3);
the calculation evaluation unit (3) includes: and the data processing module (32), the data processing module (32) is connected with the data acquisition unit (2).
2. The traction power supply equipment grounding state on-line monitoring device according to claim 1, wherein the ac/dc excitation unit (1) comprises:
a direct current power supply (DC);
a variable frequency alternating current power supply (AC);
the double-power-supply change-over switch (K) is connected with a direct-current power supply (DC) and a variable-frequency alternating-current power supply (AC) and is used for power supply switching;
and the current limiting resistor (R) is connected in series with the dual-power supply change-over switch (K).
3. The traction power supply equipment grounding state on-line monitoring device according to claim 1, wherein the calculation evaluation unit (3) comprises:
and the display screen (31) is connected with the data processing module (32) and is used for displaying the measured parameters.
4. The on-line monitoring device for the ground state of traction power supply equipment according to claim 1, wherein the data acquisition unit (2) is connected with a grounding grid branch through a wiring clamp (61) and is in data connection with the calculation evaluation unit (3).
5. The on-line monitoring device for the grounding state of traction power supply equipment according to claim 1, wherein the data acquisition unit (2) is a multi-channel data acquisition unit, each channel acquires the potential data of a grounding down conductor of one branch, and the data acquisition unit (2) is in wireless connection with the calculation and evaluation unit (3).
6. The on-line monitoring device for the grounding state of traction power supply equipment according to claim 5, wherein the data acquisition unit (2) comprises 16 data monitoring terminals and 4 GND terminals, and can acquire 16 paths of electrical quantity signals.
7. The traction power supply equipment grounding state on-line monitoring device according to any one of claims 1-6, further comprising a box (5), wherein the ac/dc excitation unit (1) and the calculation and evaluation unit (3) are integrated in the box (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320254939.5U CN219625672U (en) | 2023-02-17 | 2023-02-17 | Traction power supply equipment ground state on-line monitoring device |
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| CN202320254939.5U CN219625672U (en) | 2023-02-17 | 2023-02-17 | Traction power supply equipment ground state on-line monitoring device |
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